Cumulus and altocumulus, 5 pm on February 19, 2014, Boulder CO.

By Brian Kazar for Spring 2014 Clouds First.
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Cumulus and altocumulus, 5 pm on February 19, 2014, Boulder CO.

Altocumulus, February 18, 2014 at 5:26 PM, Boulder CO

Stratocumulus, Golden CO 2/19/2014 at 3:18pm

Mountain wave cloud with a smal Kelvin Helmholtz curl, February 19th, 2014 at around 2:50 PM

Mountain wave cloud, February 19th 2014 at 11:17 AM Boulder CO.

Pannus clouds below altostratus, Long’s Peak in Rocky Mountain National Park, February 19th 2014 at 11:17 AM.

Altocumulus radiatus, February 19th 2014 just after 6 am, Boulder CO.

A 30 second exposure shows altocumulus lenticularis reflecting city lights, 7:00pm on February 18, 2014, Boulder CO.

Mountain wave clouds, February 18, 2014 around 6pm in Littleton, CO.

Mountain wave clouds, 6 pm on February 18, 2014, Boulder CO